Accelerator for power shovels



pt 13, 1932. c. PENNINGTQN 871,427

ACCELERATOR FOR POWER SHOVELS Filed Dec. 26. 1929 iii/II;

Patented Sept. 13, 1932 UNITED S T PATENT 0am" on MILWAUKEE, wIscoNsIN, A CORPORATION; 1

ACCELERATOR, roR POWER snovELs Application filed December 26, 1929. vSerial No. 416,675.

In the operation of excavating machines, particularly shovel cranes, it isoften highly desirable, and at times even necessary, to accelerate the speed of the power source. This,

is particularly true during crowding out and boom hoisting operations of the dipper stick and boom respectively; 1 Many devices for accelerating the speed of thepower source in machines of thistype have been devised although in most instances they are highly complicated. V

An important object of the present inven:

tion is the provision of an accelerating device to be used'in conjunctionwiththe power source of an excavating machine, which de vice is marked by its simplicity. of

Another objectionable feature-to many the present types of accelerator devices is the fact that they are under-the manual control of the operator of the machine, thereby permitting such op'eratorto accelerate the power source under conditions of no load, which is obviously a highly undesirable treatment of the power source. T

A further object of my invention, therefore, is theprovision of an accelerator device which is not under the manual control of-the operator of an excavating machine but which acts incident to the operation of certain control instrumentalities therefor.

Going more into detail, I provide a cable or other flexible member which is connected at one end tothe butterfly valve of the carbu v retor of the power'source and also to the speed control me'ansor governor. The other end of the flexible member is preferably connected to the reach rod controlling the action of the clutch device'associated with either the boom hoist or dipper stick drums, or both; Of course, this end of the cable could be securedto the clutch itself orany other part of the control instrumentalities for the'drums. In order to do away with the necessity of accurateadjustments of the cable, 1' preferably, include therein an elastic membervwhich in the present instance takes the form of a coilspring; .fl' it,

l/Vith these and other objects and advantages in view, the invention comprises certain other novel constructions, combinations, and

ing drawing, in which:

arrangements of specified and claimed. I p For a fulland more complete understand: ing of the invention, reference may be had to thefollowing description and, accompanyparts as will be subsequently "Figure 1 is a perspective viewbringing out my novel invention and showing theman-v ner in which itis applied to an excavating machine. i K. n: l

Figure 2is a diagrammatic showing of the invention andQmore clearly brings outv the manner in which it is applied, to an'e 'zcavatmachine. z 1 jiF'gure 3is a pers ective view showing the connection of the cable tothe reach rod. 1 Figure 4 is a view. in side elevationof the same,and c Figure 5 is a diagrammatic, View showing the connection of the cable with the butterfly valve and the governor; I W'hile-a" preferred specific embodiment of the invention is herein set f orth,'itis to be understood that I am not to be limited to the exact constructions illustrated-and described,

because various modifications of these details operated reach rods 2 whichinturn are controlled by the usual levers as shown. at 3. A bracket 4 is secured to each of the reach rods 2 in any preferredmannersuch as by the double nuts asshown at 5. One end of a cable "CLAUDE rENNING'roN, or sAiv nineo', CALIFORNIA, ASSIGNQR 'ro KOEHRING COMPANY}.

6 is secured to one of the;brackets 4 by means 7 of a hole 7 therein, the cable then passing over pulleys as shown at 8, the other end thereof being secured to the levers 9and 10, which are connected to the butterflyvalvell'of the carburetor and the speed control means or governor .12.respectively. :'An elastic member such-as the coil spring 13 is preferablyv in-r serted somewhere in the 7 length" of; the cable 6 so as to do away with the necessity of accurate adjustments of the same.

As before pointed out, the device is very I simple in nature, being practically foolproof,

and yet at the sametime accomplishing a highly desirable result;

Theoperation of'the device is thought to be obvious, but a short explanation thereof will now begivenn Uponmovementof either of the levers 3 in a movement of one of the reach rods 2, the cable 6 will be pulled so as to actuate the rods 9 and 10, which action causes an opening of the butterfly valve 11 and an operation of the governor 12 so that the speed of thepower source B is accelerated. Such'a movement of the levers 3 is accompaniedby either a boom hoisting or dipper crowding out action. Upon reverse movement of the levers 3 for lowering the boomor racking in the dipper, which movements do not require sucha great amount of power, the reach rods :2 will be moved upwardly causing a slack in the cable 6 and no actuation of the butterfly valvell or the governor 12 will follow. It can thus .be

- seen that a highly efiicient yet simple accelerator device has been provided whichis not under the control of the operator during con"- ditions of no load. This accelerator deviceopcrates incident to movement of the control instrumentalities in such a manner as to cause a load to be thrown upon the power source, for example, during boom hoisting or dipper stick crowding out. v '7 From the foregoing,;it will be seen that I have provided a simple but efiicientaccelerator which is automatically operableinciden-t to the actuation of one of the controldevices, especially one of the clutches. Such an acceleratoris especially valuable since the same is not directly underthe control of the operator 7 of the excavating machine and isnot operable independently of the aforesaid control de vices. v

, Having thusdescribed my invention, what. 'I cla'imas new and desireto secure by Letters Patent of the United-States, is.+

1; Excavating apparatus of the class described, comprising the combination with an excavating machine and a power source therefor. provided with instrumentalities for accelerating the speed of the power source, of a control device comprising reach rods for controlling one of the movements of the excavating machine, and accelerating means including flexible cables directlyconnected "at all times to the reach rods of the. control device and to the accelerating instrumentaln ties of the power-source and automatically operable simultaneously with the operation of the control device for accelerating the rate I of Sp d f the power source during the. said movement. a r z '2. Excavatingapparatus'of the class de direction to cause downward 'with instrumentalities for scribed, comprising thecombination with an excavator machine and a power source therefor provided with instrumentalities for accelerating the speed of the power source, of control levers for controlling the movements of the machine, reach rods operable by the levers, a flexible cable connected at all times directly to the reach rods and to the acceleration instrmn-entalities of. the source of, power,

'whereuponiactuation ofany one of the levers in a direction to impose a load upon the power source pulls upon the cable to automatically accelerate the speed of the power source, and "tensionmg means inserted 1n the cables to maintain the cables always under suitable tension." I p V An-excavating machine of the class described, comprising, thecombination with a source of power for themachine provided accelerating the speed tlrcneofunder lo ad,'of cable winding and unwinding ins-trumentalities actuated by v matically 'operated to accelerate the rate of speed of the power source whileunder influence of the increased load. Y I V 4. An excavating machine of'the class de scribed, comprising, the combination with a source of power for the machine provided with instrumentalities for accelerating the speed thereof under increased load,=o f operative"instrumentalitiesfor the machine driven by the source of powerand constituting increased loadthereon during operation of the instrumentalities, devices for selectively bringing the said'instrumentalities into and out of operative relationship with the'source of power, and means including resiliently tensioned flexible cables connected with the speed accelerating instrumentalities and with the said devices for automatically accelerat ing thespeed of the power source only upon engagement of the said operative instrumen-' talities with the power; source with attendant increase in load upon the power source, the

said cables being'operative' upon the power source onlyduring the application of the in 1 creased load upon the power source. 7 7 In testimony whereof I aflix'my signature.

V V CLAUDE PENNINGTON, 

